Sub-Zero Built-in Series - Page 19

Electronic Control System
3-20
#7019014 - Revision A - October, 2010
Built-In (BI) Series
Built-In (BI) Series
Control Condenser Fan Operation
The microprocessor observes the power output to both compressors; if power is being supplied to either compres-
sor, a signal is sent to the condenser fan relay on the control board to close, supplying power to the condenser fan
motor (See Figure 3-38). If both compressors are OFF, the condenser fan will be OFF.
Figure 3-38. Signal Trace Schematic: Condenser Fan Operation
115 VOLTS
60 CYCLES
L1
NEUTRAL
N.O.
WATER FILTER SWITCH
P16
MAIN
CONTROL
BOARD
P1
3
P14
L1
L1
NEUTRAL
1164
P2
P15
85
P3
P6
P5
P6
P9
P8
P7
P18
DEFROST HTR
COMP2
COMP1
MAIN LIGHTS
N.C.
N.C.
FZ DOOR SWITCH
REF DOOR SWITCH
ISOLATION VALVE
660 Ω
WATER VALVE
160 Ω
M
IM
CONDENSER FAN MOTOR
CRISPER LIGHTS
REF LIGHTS
AIR FILTER LIGHT
FREEZER LIGHTS
FILL-TUBE HEATER
2300-2900 Ω
DEF HEATER
27.9-30.9 Ω
DEFROST TERMINATOR
REFRIGERATOR COMPRESSOR
STARTING RELAY
FREEZER COMPRESSOR
STARTING RELAY
PURPLE
WHITE
WHITE/BLUE
WHITE/BLUE
BLUE
WHITE
PURPLE
GRAY RED
PINK
YELLOW
BLACK
RED
WHITE/BLUE
TAN
BLUE
ORANGE
YELLOW
YELLOW
ORANGE/BLACK
GRAY/WHITE
ORANGE/BLACK
WHITE
RED/WHITE
WHITE/RED
TAN
PINK
GRAY
ORANGE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
WHITE
TAN/WHITE
TAN /WHI TE
BROWN
YELLOW
WHITE
HIGH VOLTAGE
1. Power output to
compressors
observed by
microprocessor
2. If power is supplied to
either compressor, the
condenser fan is energized
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